In a blog post titled “A final statement on SpatialOS and Unity,” the team at the cloud gaming startup aimed to tell their side of the story and implored Unity to “clarify their terms or unsuspend our licenses.”

Unity is a game engine that developers use to create, among other things, games. Improbable offers a cloud solution to developers that basically enables large multiplayer online gameplay by rendering the game worlds across multiple servers on its SpatialOS platform.

Yesterday, Improbable announced that Unity had terminated their game engine access and that developers that used SpatialOS were in danger of losing their work. Unity responded that live and in-development games were fine and that Improbable was in violation of their new terms of service and needed to negotiate a new partnership.

In the new blog post, Improbable doesn’t mince words, saying it “still has all its Unity license and access suspended. We cannot easily fix bugs, improve the service or really support our customers without being in a legal grey area. Anyone who has ever run a live game knows this is a farcical situation that puts games at risk.”

Last night, Improbable appeared to leverage their relation with rival engine-maker Epic Games to put the heat on Unity, creating a $25 million fund with the gaming giant to help developers move to “more open engines,” a pretty transparent knock on Unity.

Improbable now seems to be claiming that Unity basically changed the rules on them and was trying to bully them into a deal that none of their other partners have requested.

“We do not require any direct technical cooperation with an engine provider to offer our services – Crytek, Epic and all other providers clearly allow interoperability without commercial arrangement with cloud platforms. We have no formal technical arrangements there and have not required any with Unity for years.”

Losing Unity support is a huge blow to Improbable, which has raised $600 million largely on the promise that it can revolutionize online gaming, something that would prove difficult to do without one of the largest available game engines.